Reversible traversing motion



HENRI ARNOLD JOHANNES DE BULL NACHENIUS.

REVERSIBLE TRAVERSING MOTION.

APPLICATION HLED APR. 29. 1919.

1,350,560. Patented Aug. 24, 1920.

4 SHIETS-SHEET'I.`

/ff f HENRI ARNOLD JOHANNES DE BULL NACHENIUS.

REVERSIBLE TRAVERSING MOTION, APPLICATION FILED APII.29, 1919.

1,350,560. l Patented Aug. 24,1920.

4 SHEETS-SHEET 2.

HENRI ARNOLD JOHANNES DE BULL NACHENIUS.

REVERSIBLE TRAVERSING MOTION, APPLICATION FILED APII. 2:9. I9I9.

Patented A ug. 24, 1920,- 4 SHEETS-SHEET 3. FJE.

a LI i i "1@ i A l z/e/ea/ /i/z wZa/r/arznes Qy//m/enz/.S

HENRI ARNOLD JOHANNES DE BULL NACHENIUS.

REVERSIBLE TRAVERSING MOTION,

APPLICATION FILED APR.29, 1919.

1,350,560, Patented Aug. 24,1920.

4 SHEETS-SHEET 4.

*UNITED ,sTATEsfifrATENT OFFICE..

' HENRI ARNOLD JOHiiNNnsDE BULL NacHiiNius.' or HAARLEM, NETHERLANDS.

To all whom/it may concern.'

Be it known that I, `HnNRi vARNOLD JOHANNES on B'iJLLNacnENiUs, a subjectfof the Queen of the Netherlands, residing'at Haarlem, Netherlands, have invented certain.

new and useful improvements in Reversible Traversing Motions, of which the following is a specification.

This invention is for improvements in and relating to reversible traversing motions of the kind in which linear motion is given to a traversing member by means of screw threads, each with va nut mounted thereon,

the traversing member being provided with I friction surfaces cooperating` with correi sponding friction surfaces on the nuts.

The constructions hitherto employed have the inconvenient feature that the reversal of the linear. motion is not automatic and must be effected manually by morejzorless com-iv plicated mechanism.

rIhe object of the present invention is to obtain automatic reversing of theltraversing member. According to this invention, prefei'ably spring loaded arresting means adapted tocoperate with the nuts are provided at the ends of the screws.

In order that the automatic reversing of the traversing member may be effected in two stages, I may mount on each of the nuts a sleeve free to slide. axially thereon but locked against rotation, and provide each of said sleeves with a Vfriction surface coperating with a corresponding friction surface on the traversing member as well as with a friction surface mating with a corresponding friction surface on the other sleeve, so that on axial displacement of one sleeve relative to the other the last mentioned friction surfaces will contact before thesleeves engage or disengage the traversing member.

In the accompanying drawing :y

Figure 1 is a sectional view of the traversing member and 'of the nuts Fig. 2 is a sectional view ofthe traversing member, nuts and sleeves for a two-stage reversing, the rotating element, constituted byja screw spindle .having both fright and left hand threads cut uponfit`,being illustrated in elevation; Y l Y Fig. Sis a part sectional elevation of a complete transmission 'gear constructed in accordance; with the principles `of, the inven-` tion; Y

Fig. 4

's a plan viewof the gear shown vin Fig. 3; A

L, j x nnvnnsi'BLE- TRAVERSING MOTION.

Y y -Sneci'cation of Letters Patent. Patented A110', 24,1920., l applicati@fn'djiiprii 29, i919. "serial No. 293,461. i

fing. v5 is a pafi'seaiomi "View i a". daan;

of theV gear shown 'in Fig. 3;

Fig. 8 is a plan view of a gear comprising three lparallel screws all having threadsl of the y*saine type cut upon them; y

Fig. 9 illustrates on an enlarged scale the l traversing fmember of the gearI shown Vin Fig. 10 is a front view of Fig. 9. f

.InFig 1, the reference numerals 1 and 2 designate a right-hand and a left-hand nut respectively, mounted upon an axially fixed screw (not shown) having both right and left hand threads each made to engage the corresponding nut as required. The inner faces of the nuts are provided with races 3 anelliY respectively, both adapted to contact with a row of balls 5, and further said nuts have cone-shaped friction surfaces 6 and 7 whose apeXes point in opposite directions. Mounted between these friction cones is lan annular member 8 provided with, corresponding internal friction cones 9, 1Y0, it

being'understood that when the races 3 and l are both in engagement with the balls 5 and the cone 9 is in contact with the cone 6, the cones 10 and 7 are clear of one another. The annular member S is integral with trunnions 11, 12 secured to which are slippers 13, 14C guided by suitable surfaces (not shown). It will be readily understood that the ball bearing 3, 1, 5 is no essential element in the construction, and that it may be replaced by any other suitable thrust bearing. l

Assuming the screw on which the nutsl and2are mounted to be rotated at high speed, for instance, by an electricrmotor, and further assuming the cone 6 to be forced into engagement with the internal cone 9, the nut 1 will have no freedom of rotary motiontso that it will travel alongr the screw, for in .ivplo and 7contact withone another', whereby the I Vnut'2is contact, the cone 7, 'the,vsleeve 1G and'rtheV Y screw 'spindle on the nutl 1, and cionsefqiiently:V the circumferential force that tends to rotate -f the nut are increased. Y ,1 As soon as this cumferential force exceeds the constant frictional resistance between cones-6 and,9,.the

their Vmomentum the annular member 8'" and the partsV associated .therewith continue mov-v ing to the right-until'the' mating surfacesflO held against rotation by the member 8 and, in consequence, Vcommences 'fto travel alongthe screw spindle to the left, driving the nut 1 ,rotating idly aheadof it. Simi--` larly, when the inactive nut 1 abuts against the' arresting means provided at the left hand end of "the Vscrew spindle, it will Vagain 'be locked against rotation, the nut 2 having. kso 'that the reverse been :previously released, traverse is automatically brought about. 'y

The taper of the mating frictionsurfaces isdeterminedso that when the 'end pressure needed'tomainta'in tli'esurfaces in drivingV contact isreinoved the cooperating surfaces will 'at once cease to'adliere, anddisengalgement at once takes place.

` In F ig.:72, each of the nuts 1 and 2 car-` ries a sleeve 15 and 16 respectively'to freely' slide but'not :rotate thereon.Y Said sleeves haveffriction conesr, 7 mating with corresponding friction cones 9, 10 on 'the anvnular member 8*,and plane friction surfaces' Y18, 19 at right angles to tlieaxis of the screw spindle 17, lthe arrangement being suoli ythat on the sleeve 16 ,being 'moved from tlierposition shown towY rd the sleeve 15, the friction surfaces 18, 1 9move into end contact with prior to the friction cone` 7 (eneach other. y gaving its mate cone 10. Y

. ssuming 'the sleeve 1b to be arrested. at

the end ofitsright hand stroke, itf'will move tothe lefti'elative to the nut 2 so as tof bring aboutfend vcontact between the plane friction surfaces Y18 ai1d`19. In consequence, Y a portion 'of the momentumV ofnut 2 and-V associated' parts (sleeve` 16Y and cone 7)y is conversedinto friction, thus producingacir-V cumferential force which .tends to causelthe cone to'v turn relative to thercone 9 of ring 8'; as'isoon as slipping occurs,ithe cone the nut 1 are free-to the cones nut 2 areA held against rotation, whereby the vKnut 2`bfecon'ies active and moves to the left, ldrivingthe'nut 1 and yassociated parts rotat-v ing idlyI on the screw spinr'llefahead of it.

'The's'crew spindle 177' with the nuts thereon is preferably 'mounted in an oil casing. Asv the oil 'in vsaidV casing; offers considerable A.mounted in an oil casing 28.

ying members 34,

The said spring Y 1,35o,56o

entering through the clearance between the shield's20, 21 and-the sleeves 15, 16 is discharged through the openings 22,23 byeen- Y trifugal force.

In igs. 3, 4, 5 and 6 the shaft 26 of an electric linotorf27'is coupled with a spindle 17 .having both rightfaiid left hand threads cut upon it andjca'rryinga mechanism substantially asillustrated in Fig. 2. The screw spindlev and the traversing` Vmember are The annular member'8 is integralwith trunnionsll, 12

moving .with Vslippers 13, 14 on longitudinal guide surfaces oi ,the casing 28 and pivoted to connecting rods 29, 30 projecting outside the case Vthrough'stuiling'boxes 31,' 32. Said connecting roc s may be coupled in any couvenient manner Vwiththe member to which reciprocating motion is to be imparted.

lSlidably mounted on the screw spindle 17 adjacent its opposite ends is a pair of arrest (only one' of Vwhich appears) each loaded by a coiled spring 36. has for it'sduty not Vonly-to resiliently take upjthe v,impact caused by the reversal ofthe traversing member, but also, by its relaxation after being compressed, to positively force the Vidly Yrotating nut against the annular-member 8, which may benecessary if the momentum of the traversing member'and associated parts, after disengagement ofthe 'active nut, is not sufficient to caus'ethe' movement to continue until the ring 8 .contacts with the inactive nut, for

instance, in the case of'puinps. v .Y

It will beunderstood that the stroke of vthe traversing member ymay be varied simply by adjusting the distance between the arresting members 34 in some convenient manner. l" ig. 7V shows anembodiment of the invention wherein an electric motor 27 with vertical rshaft drivestlie plunger 38 of a pump through the 'medium of the nuts 1 and 2 mounted 'on the screw spindle 17 in alincment and coupled with the motor shaft.

In Figs.'8, 9 and 10,`a spindle 39 is coupled in alinement with the shaft 26 of an electric y'motor 27,a Vgear 40 keyed upon said l spindle'meshing Vwith gears 41v 42 on parallel ,i

spindles 43,44, sojtlat onthe motor beingV started rotary motion will ybe, imparted tothe spindles43,`44 in a direction opposite to that of spindle39. The spindles ,39, 43, 44, which haveV allthe threads of the same type cut upon them', extend through openings in the front and' rear walls of a casing 45,'secured torwhichpare trunnions 11, 12V andslippers 13, 14` guided by suitable Yguide surfaces.

screw spindles 44, 43 and 39 respectively. Inside th` casing 45` is a plate 46 having freedom of axial displacement therein and lprovided with races forming parts Yof the thrust ball bearings bywhich the end pressures o f the nuts at one side of `the casing 45 are transmitted to the nut at the opposite side. The operation of this transmission gear will be understood without further ex*- planation. 1

In transmission gear of the type referred to it is obviously necessary for the pitch of the screws to exceed a certain limit as otherwise the idly rotating inactive nut-would produce such a resistance as to act self stop- Vv' hen using right and left hand screw threads for reciprocating the nuts, I may give the screws' different pitches so that the traversing member travels with greater speed in the one direction than in the other. lVith an arrangement similar to that shown in Fig. S I may obtain the same effect by allowing the screw spindles rotating clockwise to turn at a higher speed than those rotating countercloclrwise.

Although the provision of fixed or spring loaded arresting means as described on the screw spindle or spindles is the simplest way of automatically bringing about the engagement and disengagement of the nuts l; 2 on the one side, and the annular member 8 or the casing 45 on the other side, it is evident that other means may be employed for the same purpose,- for instance, automatically operated clutch couplings.

Having now particularly described and ascertained the nature of my present invention and in `whatmanner the saine is to be performed, I declare that what I claim is:

l. In a traversing motion, the combination of a screw having both right-hand and left-hand threads thereon; nuts coactive with said threads, each nut having` a friction surface; a traversing member having friction surfaces for coaction with those on the nuts; and means disposed at the opposite ends of the screw for coaction with said nuts to effect automatic reversal of the traversing member.

2. In a traversing motion, the combination of a screw having both right-hand and Vleft-hand threads thereon; nuts coactivev4 with said threads, each nut having a friction surface; a traversing member having frictienY surfaces for coaction with those on the nuts; and resilient arresting means disposed at the 'opposite ends of the screw for alter- -nate engagement with said nuts to effect automatic reversal of the traversing member.

3. In a traversing motion, the lcombination of a screw having both right-hand and left-hand threads thereon; nuts coactive with said threads; a traversing member adapted to be coupled to and uncoupled from said nuts in alternation; and resilient lineans disposed at the opposite ends of the screw for coaction with said nuts to automatically effect their alternate coupling and the consequent reversal of the traversing member.

4. In a traversing motion, the combination of rotating drivingi means; nuts threaded thereon and having conical friction surfaces; a traversing member mounted on said driving means and having conical friction surfaces coactivc with those on the nuts; and means disposed at the opposite ends of the driving means for coaction with said nuts to effect their alternate coupling and the consequent reversal of the traversing member.

5.. In a traversing motion, the combination of rotating driving means; nuts threaded thereon; a sleeve mounted on each nut for axial sliding movement but locked against rotation, each sleeve having a pair of separate friction surfaces; a traversing member having a pair of friction surfaces for coaction with one pair of the friction surfaces on the sleeves; the other pair of friction surfaces on the sleeves mating with each other and adapted to Contact, on relative axial movement of the sleeves, prior to the engagement or disengagement of the firstnamed pair of surfaces with or from those on the traversing member; and means disposed at the opposite ends of the driving means for coaction with the nuts to effect automatic reversal of the traversing member. y

In testimony whereof I affix my signature.

HENRI ARNOLD JOHANNES DE BULL NACHENIUS. Witnesses: D. KLIYN,

M. ALVARADO. 

